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en.wikipedia.org/wiki/Cave_of_the_Crystals

Cave of the Crystals or Giant Crystal Cave is a cave connected to the Naica Mine at a depth of 300 metres (980 ft), in Naica, Chihuahua, Mexico. The main chamber contains giant selenite crystals (gypsum, CaSO4·2 H2O), some of the largest natural crystals ever found.

ngm.nationalgeographic.com/2008/11/crystal-giants/shea-text

Dozens of purple and white crystals push up from it like shards of glass. ... Nothing compares with the giants found in Cueva de los Cristales, or Cave of Crystals.

sciencing.com/crystals-5640076.html

Jun 22, 2017 ... Abandoned quarries where sand and gravel have been removed provide another location where crystals can sometimes be found, depending ...

pixiecrystals.com/where-do-crystals-grow.php

The huge mines are now closed, awaiting possible reopening, but the crystals and minerals that have been found and extracted here in the past 100 years ...

www.crystalinks.com/mexicocrystals.html

Naica is a lead, zinc and silver mine in which large voids have been found, containing crystals of selenite (gypsum) as large as 4 feet in diameter and 50 feet  ...

www.beautifulworld.com/north-america/mexico/cave-of-the-crystals

The Cave of the Crystals is a natural marvel in Chihuahua, Mexico. ... Alas, the man was found dead the next day; cooked, as though he were food in an oven.

www.bbc.com/earth/story/20150623-ten-crystals-with-magic-powers

Jun 22, 2015 ... In 1669, Danish scientist Nicolas Steno noticed that quartz crystals, irrespective of where on Earth they were found, always showed the same ...

www.tourismontheedge.com/get-extreme/largest-crystals-in-the-world-giant-crystal-cave-mexico

Jan 4, 2013 ... The spectacular Giant Crystal Cave is connected to the Naica Mine, located in Chihuahua, Mexico. It goes around 300 meters bellow the ...

nature.berkeley.edu/classes/eps2/wisc/Lect3.html

A similar, familiar processes is formation of salt crystals by evaporation of sea water. The mineral that forms is determined by what the dissolved elements are.